Job sites are basically designed to exploit clueless people (on both sides of the transaction). You're not clueless, or you are shortly to become less clueless, so you should never be involved with a job site.
Draw a rectangle, where one side is the number of people with hiring authority you've had coffee with recently and the other side is your attractiveness as a candidate. As the area of the rectangle gets bigger, the number of job offers you get will increase. (And, if you're savvy about it, the attractiveness of them will as well.)
If you already have Google on your resume, increasing your attractiveness as a candidate is probably not as good ROI as lining up more coffee dates. They are really easy to arrange: start by knowing at least one person in Silicon Valley who has hiring authority. (Your local Internet has a few hundred options.) Ask for introductions.
The custom is for a short two-line email: "Hey Bob, meet Dave. Dave is a smart chap, he previously worked at Google. You guys should get in touch." Dave then sends Bob an email inviting him to get coffee. (There are other options: lunch and dinner work, too, but asking someone to coffee is basically the smallest imposition you could possibly make which still gets you face time and you want face time.)
Or, if you're opposed to networking (which seems oddly common among engineers), put on a T-shirt which says "I am looking for an engineering job. Previous work experience: Google" and walk down Castro during lunch hour. You'll probably get three offers.